Trip Computer

The trip computer contains a self-diagnostic function to check for any malfunction of circuitry or display. Pressing the "RANGE", "TRIP" and "CLOCK" buttons at the same time will light up all 7 segments for 3 seconds. After 3 seconds, each digit counts down from 9-0 (zero), pausing for .5 seconds each. During this time, the other various displays will flash alternately. The self-diagnostic function is cancelled after after one cycle or if another button is pushed.